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FORUMS Photography Talk by Genre Astronomy & Celestial Talk 
Thread started 24 Aug 2015 (Monday) 09:41
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Avoid condensation in lenses

 
cgmds73
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Aug 24, 2015 09:41 |  #1

Hi.

I'm trying to find a heat strap to prevent condensation on the lens.
I could not find any on amazon, i was searching for "heat strap", "lens heat strap", "telescope lens strap", and the results nohting has to do with heat straps i'm looking for ... (spanish is my natural language, maybe i'm using the wrong words in search)

Anyone can give a link or website ?

Thanks.


https://www.flickr.com​/photos/elojotorpe/ (external link)

  
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Intheswamp
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Aug 24, 2015 09:50 |  #2

cgmds73 wrote in post #17680975 (external link)
Hi.

I'm trying to find a heat strap to prevent condensation on the lens.
I could not find any on amazon, i was searching for "heat strap", "lens heat strap", "telescope lens strap", and the results nohting has to do with heat straps i'm looking for ... (spanish is my natural language, maybe i'm using the wrong words in search)

Anyone can give a link or website ?

Thanks.

Search for the words: dew heater

Ed


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cgmds73
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Aug 24, 2015 09:53 as a reply to  @ Intheswamp's post |  #3

thank you !! that's what i was looking for !


https://www.flickr.com​/photos/elojotorpe/ (external link)

  
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Intheswamp
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Aug 24, 2015 09:57 |  #4

Glad to help.

Ed


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WildImages
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Sep 06, 2015 14:34 |  #5

A hand held portable hair dryer is a marvelous tool. It does not have to be in use all the time, just every once in a while. It will sure keep the dew off the lens or telescope element.

Good luck!




  
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Intheswamp
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Sep 06, 2015 16:42 |  #6

In regards to "alternative" ideas you could use one of those chemical "hand warmers"...rubberband it to the lens. Some moving air is good...12v fan running off a battery or a vehicles power-port/cigarette lighter...you might not even need any heat with the moving air.

Ed


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Luckless
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Sep 08, 2015 09:45 |  #7

One thing to consider is that water vapour needs something to condense out onto, and one of the best things for it to latch on to is liquid water. Once condensation starts forming it will have a greater and greater effect as a larger surface area of liquid water forms and collects on your gear. Even if you try and wipe it up with a cloth there will still be more liquid water on the lens element than when it was actually dry, which will encourage more water to condense out, and your problem will just keep accelerating.

Focusing on keeping it from forming in the first place will give you far fewer headaches than trying to rely on any method that focuses on cleaning it up after it has formed.


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Nighthound
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Sep 08, 2015 14:10 |  #8

Luckless wrote in post #17699362 (external link)
One thing to consider is that water vapour needs something to condense out onto, and one of the best things for it to latch on to is liquid water. Once condensation starts forming it will have a greater and greater effect as a larger surface area of liquid water forms and collects on your gear. Even if you try and wipe it up with a cloth there will still be more liquid water on the lens element than when it was actually dry, which will encourage more water to condense out, and your problem will just keep accelerating.

Focusing on keeping it from forming in the first place will give you far fewer headaches than trying to rely on any method that focuses on cleaning it up after it has formed.


Yes, dew and frost prevention is far better than removal. A good heater controller and strap will take the hassle out of the equation.

It'll run about $190 to get the two pieces needed, but if you shoot at night in moist and/or very cold conditions it'll be money well spent.

Controller
http://www.highpointsc​ientific.com …al-channel-dew-controller (external link)

Strap
http://www.highpointsc​ientific.com …gsearch/result/​?q=dew+not (external link)


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calypsob
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Sep 08, 2015 22:40 |  #9

You can build one for $10


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AbPho
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Sep 14, 2015 07:55 |  #10

Uhhhhh. Do tell how to that is possible!!!!


I'm in Canada. Isn't that weird!

  
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LV ­ Moose
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Sep 14, 2015 08:25 |  #11

AbPho wrote in post #17706868 (external link)
Uhhhhh. Dew tell how to that is possible!!!!

Fixed it for ya. ;-)a


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AbPho
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Sep 16, 2015 14:18 |  #12

It was a play on words. Lol. But still curious how to build a $10 dew heater.


I'm in Canada. Isn't that weird!

  
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Niteclicks
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Sep 16, 2015 15:48 |  #13

Check out deepskywatch.com for one version. Instead of nichrome others use resistors (cheap) connected in a ladder fashion between two wires. The trick is getting everything set so the max setting won't melt anything.




  
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AbPho
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Sep 16, 2015 15:54 |  #14

Thanks niteclicks.


I'm in Canada. Isn't that weird!

  
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Luckless
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Sep 16, 2015 15:57 |  #15

Personally I would rather spend a little more for a proven and tested design rather than cobbling something together on the cheap. If I were to build something myself then I would be planning to spend a bit more than just $10, and include redundant thermalcouples and a digital controller.

Doesn't really make all that much sense to skimp on something that could be a fire hazard, and then stick it on potentially thousands of dollars of equipment that you're possibly not watching overly closely as the night goes on.


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Avoid condensation in lenses
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